Is peanut butter a fluid Y e s No May b 52% 24% 24% 1. Yes 2. No 3. Maybe Chapter 14 Fluid Mechanics-Statics What is a fluid? • A fluid is a state of matter where atoms collide with each other but can move past each other (as opposed to a solid) • A liquid is a dense fluid in which atoms interact with each other almost continuously • A gas is a sparse fluid in which atoms collide with each other infrequently. • In a liquid the shape of the material changes in reaction to force, but the volume does not vary much. • In a gas, the shape and volume of the material is variable.

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Chapter 14 Fluid Mechanics-Statics What is a fluid? • A liquid cannot sustain shearing stress – it will give way if you push on it • It might prevent you from moving fast but it will eventually yield to force. • Imagine trying to walk in a swimming pool.

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